Japanese researchers found that olive oil given to mice before glucose slowed gastric emptying and reduced the immediate rise in blood sugar, strengthening the case for testing meal sequencing in people.
Researchers in Japan say the order in which food reaches the gut may change how sharply blood sugar rises after a meal, with fat appearing to blunt the early spike that follows carbohydrates. In work published in the journal Diabetes, a team led by Kyoto University found that giving olive oil to mice before glucose slowed gastric emptying, the process by which the stomach releases food into the small intestine, and reduced the immediate rise in blood glucose.
The findings add weight to a simple dietary idea that has already shown promise in people: eating vegetables, protein or fat before carbohydrates can soften the post-meal surge in glucose. According to Kyoto University, that approach may offer a practical way to improve glucose control without removing foods from the diet altogether, a point the researchers said makes it potentially easier to sustain in daily life.
The experiments suggest the effect is not driven by a single pathway. The mice released more glucagon, GIP and GLP-1 after fat was given first, and the glucose-lowering effect persisted even in animals with type 2 diabetes and severe insulin deficiency. Glucagon is usually associated with raising blood sugar, but the study suggests that, in this setting, it may be part of a coordinated response with GLP-1 and nerve signalling that slows the delivery of glucose from the stomach to the intestine.
That interaction appears to matter. Blocking either glucagon or GLP-1 alone did not remove the benefit, but blocking both did, pointing to partly overlapping roles. The researchers also found signs that the vagus nerve, which carries signals between the brain and the digestive system, contributes to the effect. Although the work was done in mice, reports from ScienceDaily, ScienceAlert and Kyoto University all point to the same broader implication: meal sequencing could become a useful, low-cost tool for people trying to manage post-meal blood sugar, especially those with diabetes. For now, the research strengthens the case for larger human studies to test how reliably the effect carries over to everyday eating.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
